Changes in 0.10.3 [2018.07.02]

Changes in 0.10.2 [2018.07.02]

Sync with base-4.12/GHC 8.6

Introduce the Data.Functor.Contravariant.Compat module, which
reexports Data.Functor.Contravariant from base (if using GHC 8.6 or
later) or the contravariant library (if using an earlier version of GHC).